[Xen-users] System does't boot properly with IOMMU enabled

[Paul Szymanski <paul.szymanski.1993@xxxxxxxxx>]

Hello,

I'm using Qubes-OS R3.0 rc2 on a USB stick to install Qubes-OS

If I enable vt-d in BIOS the display gets heavily corrupted when X gets
started (text mode works fine). But besides that, it seems like the system
is successfully continuing booting.

By disabling IOMMU Qubes gets successfully installed and is usable.
But if I enable IOMMU the display gets corrupted again while starting X
and the system freezes after entering the decryption passphrase.

To get some more information I did the following:
1. Start the system with IOMMU enabled
2. Wait for supposedly system boot complete
3. Reboot the system, with IOMMU disabled this time
4. Retrieve logs from previous startup.

/var/log/Xorg.0.log.old
http://nopaste.linux-dev.org/?672248

/var/log/messages
http://nopaste.linux-dev.org/?672289

/var/log/xen/console/hypervisor.log
http://nopaste.linux-dev.org/?672308

I posted the logs to this mailing list:
https://groups.google.com/forum/#!topic/qubes-users/ljrqn0eMXHI

This was the response:

> The last one looks interesting:
> (...)
> (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000000001ac from
> 0x0000000000a800c8 to 0x0000000080a880c8.
> (XEN) printk: 1 messages suppressed.
> (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000000001ac from
> 0x0000000000a800c8 to 0x0000000080a880c8.
> (XEN) printk: 1 messages suppressed.
> (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000000001ac from
> 0x0000000000a800c8 to 0x0000000080a880c8.
> (XEN) printk: 1 messages suppressed.
> (XEN) traps.c:2524:d0 Domain attempted WRMSR 00000000000001ac from
> 0x0000000000a800c8 to 0x0000000080a880c8.
>
> "d0" here is "dom0". Since those messages are in both good and bad boot,
> I'm not sure if it is related, but its likely.
>
> Anyway at this point I think its better to ask on xen-users or even
> xen-devel mailing list. They will be able to provide much better
> support.

Can someone help me with this issue?

My System:
Dell Latitude E4310
Intel Core i5-540M Processor

Best regards,

Paul Szymanski

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